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XJ using a lot of gas

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Old 10-18-2013, 09:22 AM
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Default XJ using a lot of gas
My XJ is using way too much gas, out of nowhere. I used to get 15mpg at least, but this week I've been getting around 7.

I've also noticed, that when I first hit my gas pedal after sitting still, it kind of cuts out before sounding like normal, when accelerating, just for half a second.


Anyone know what this might be?
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Old 10-18-2013, 09:32 AM
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What yr XJ? 4.0?
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Old 10-18-2013, 11:39 AM
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Yes, much more info is needed here!
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Old 10-18-2013, 04:00 PM
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Sounds normal for an '84 with V12 swap and twin 8 bbl carbs held on with duct tape
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Old 10-18-2013, 04:02 PM
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TPS sensor. Mine did the same thing.
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Old 10-18-2013, 04:02 PM
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Originally Posted by ShermanTanker
TPS sensor. Mine did the same thing.
The OP has a TPS?
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Old 10-18-2013, 04:08 PM
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Yup! I'm pretty sure all 1994 Xj's have one? Maybe I'm wrong....
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Old 10-18-2013, 04:09 PM
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Originally Posted by salad
The OP has a TPS?
LOL
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Old 10-18-2013, 04:13 PM
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Sorry maybe I missed something? What is funny? I was just trying to be helpful? I realize that there is a lack of information on his particular XJ. I just looked at his previous post and it stated he had a 1994 XJ 4.0....
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Old 10-18-2013, 04:16 PM
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Originally Posted by ShermanTanker
Sorry maybe I missed something? What is funny? I was just trying to be helpful? I realize that there is a lack of information on his particular XJ. I just looked at his previous post and it stated he had a 1994 XJ 4.0....
Ah.

However, nothing's posted in this thread... kind of a biggy for people who aren't regular followers.
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Old 10-18-2013, 04:16 PM
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Also what he has described above are classic signs of a bad throttle position sensor. Don't get me wrong it could be a whole host of other issues but a tps seems the most plausible.

Aaron
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Old 10-18-2013, 04:18 PM
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Originally Posted by salad
Ah.

However, nothing's posted in this thread... kind of a biggy for people who aren't regular followers.

Sorry i'm new here...I understand completely! It does make it hard to try to figure out, and I agree more information should be posted.
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Old 10-18-2013, 04:18 PM
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Originally Posted by ShermanTanker
Also what he has described above are classic signs of a bad throttle position sensor. Don't get me wrong it could be a whole host of other issues but a tps seems the most plausible.

Aaron
Actually, for a pre-97 XJ with the 4.0, that kind of massive loss in fuel economy is most often the MAP vacuum tube has broken or come off.
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Old 10-21-2013, 11:40 AM
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94 xj 4.0
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Old 10-21-2013, 11:43 AM
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Originally Posted by salad
Actually, for a pre-97 XJ with the 4.0, that kind of massive loss in fuel economy is most often the MAP vacuum tube has broken or come off.
Where is that located?
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